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CVE-2026-84134 is an unspecified vulnerability in the Profile Backup component of Mozilla Firefox and Mozilla Thunderbird. Mozilla corrected the issue in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird ESR 153.2. Available technical information does not identify the underlying flaw class, affected function, attack vector, or CVE-specific security consequence.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Fedora 44 Thunderbird update.
An unspecified security issue in the Profile Backup component.
A vulnerability addressed by the Fedora 45 Thunderbird security update; the vulnerability type is not specified.
An unspecified security issue in Firefox's Profile Backup component.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.